package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.UserNotLoginException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;

    private final String url = "https://api.weixin.qq.com/sns/jscode2session";
    
    @Override
    public User WechatLogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空如果为空表示登录失败，抛出异常
        if (openid==null){
            throw new UserNotLoginException("登陆失败");
        }
        //判断当前用户是否为新用户
        User user = userMapper.select(openid);
        //如果是新用户，自动完成注册
        if (user==null){
            user = User.builder()
                        .openid(openid)
                        .createTime(LocalDateTime.now())
                        .build();
            userMapper.insert(user);
        }
        //返回这个用户对象
        return user;
    }

    private String getOpenid(String code){
        //发送请求获取取openid和session_key
        Map<String, String> map=new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(url, map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
